/* ============================================================
   个人博客导航站 · 全局样式
   浅色主题（默认）+ 深色主题（data-theme="dark"）
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #f7f5f0;              /* 暖纸色底 */
  --surface: #ffffff;
  --surface-2: #f0ede6;
  --text: #23262b;            /* 墨色 */
  --muted: #77716a;
  --line: #e6e1d6;
  --accent: #0e7490;          /* 深青 */
  --accent-ink: #0b5e75;
  --accent-soft: rgba(14, 116, 144, .09);
  --radius: 16px;
  --shadow: 0 8px 28px rgba(35, 38, 43, .07);
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
          "Microsoft YaHei", "Noto Sans SC", "Segoe UI", sans-serif;
  --mono: "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --maxw: 1080px;
  --articlew: 760px;
}

[data-theme="dark"] {
  --bg: #141619;
  --surface: #1d2025;
  --surface-2: #262a31;
  --text: #e9e6df;
  --muted: #9b968c;
  --line: #2e333b;
  --accent: #6fc7d8;
  --accent-ink: #8fd8e6;
  --accent-soft: rgba(111, 199, 216, .12);
  --shadow: 0 8px 28px rgba(0, 0, 0, .4);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;                 /* 中文阅读行高 */
  letter-spacing: .02em;            /* 中文微调字距 */
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background .25s ease, color .25s ease;
}

a { color: var(--accent-ink); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.05rem; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand .logo-img {
  width: 32px; height: 32px; border-radius: 10px; flex: none;
  object-fit: cover; box-shadow: var(--shadow);
}
.nav-links { display: flex; align-items: center; gap: 6px; list-style: none; }
.nav-links a {
  color: var(--muted); padding: 8px 14px; border-radius: 10px;
  font-size: .95rem; transition: .2s;
}
.nav-links a:hover { color: var(--text); background: var(--accent-soft); text-decoration: none; }
.nav-links a.active { color: var(--accent-ink); background: var(--accent-soft); font-weight: 600; }

.theme-btn {
  border: 1px solid var(--line); background: var(--surface); color: var(--text);
  width: 38px; height: 38px; border-radius: 12px; cursor: pointer;
  display: grid; place-items: center; font-size: 1.05rem; transition: .2s;
}
.theme-btn:hover { border-color: var(--accent); transform: translateY(-1px); }

.menu-btn { display: none; border: 1px solid var(--line); background: var(--surface); color: var(--text);
  width: 38px; height: 38px; border-radius: 12px; cursor: pointer; font-size: 1.1rem; }

/* ---------- 页脚 ---------- */
.site-footer { margin-top: auto; border-top: 1px solid var(--line); padding: 28px 0; color: var(--muted); font-size: .88rem; }
.site-footer .wrap { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 84px 0 64px; overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: -40% -20% auto; height: 130%;
  background:
    radial-gradient(420px 220px at 18% 30%, var(--accent-soft), transparent 70%),
    radial-gradient(520px 260px at 85% 20%, var(--accent-soft), transparent 70%);
  pointer-events: none;
}
.hero-inner { position: relative; display: flex; gap: 48px; align-items: center; }
.avatar {
  width: 148px; height: 148px; border-radius: 36px; flex: none;
  box-shadow: var(--shadow); border: 4px solid var(--surface); object-fit: cover;
  background: var(--surface-2);
}
.hero h1 { font-size: 2.4rem; line-height: 1.35; letter-spacing: .04em; margin-bottom: 10px; }
.hero h1 .dot { color: var(--accent); }
.hero .tagline { font-size: 1.08rem; color: var(--muted); max-width: 560px; margin-bottom: 22px; }
.hero .tagline strong { color: var(--accent-ink); font-weight: 600; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 11px 22px; border-radius: 12px; font-size: .95rem; font-weight: 600;
  border: 1px solid transparent; cursor: pointer; transition: .2s; letter-spacing: .04em;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #fff; box-shadow: var(--shadow); }
.btn-primary:hover { background: var(--accent-ink); }
.btn-ghost { border-color: var(--line); color: var(--text); background: var(--surface); }
.btn-ghost:hover { border-color: var(--accent); }

/* ---------- 分区标题 ---------- */
.section { padding: 40px 0; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 22px; }
.section-head h2 { font-size: 1.35rem; letter-spacing: .06em; display: flex; align-items: center; gap: 10px; }
.section-head h2::before { content: ""; width: 6px; height: 22px; border-radius: 3px; background: var(--accent); }
.section-head p { color: var(--muted); font-size: .9rem; }

/* ---------- 导航分组卡片 ---------- */
.link-groups { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 20px; }
.group-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; box-shadow: var(--shadow); transition: .25s;
}
.group-card:hover { transform: translateY(-3px); }
.group-card h3 { font-size: 1.08rem; letter-spacing: .05em; margin-bottom: 4px; }
.group-card .gdesc { color: var(--muted); font-size: .88rem; margin-bottom: 16px; }
.link-list { list-style: none; display: flex; flex-direction: column; gap: 2px; }
.link-list a {
  display: flex; align-items: center; gap: 12px; padding: 10px 12px; border-radius: 10px;
  color: var(--text); transition: .15s;
}
.link-list a:hover { background: var(--accent-soft); text-decoration: none; }
.link-list .lname { font-weight: 600; font-size: .95rem; white-space: nowrap; }
.link-list .ldesc { color: var(--muted); font-size: .85rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.link-list .arrow { margin-left: auto; color: var(--accent); font-weight: 700; flex: none; }

/* ---------- 博客列表 ---------- */
.post-list { display: flex; flex-direction: column; gap: 16px; }
.post-card {
  display: block; background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 26px 28px; box-shadow: var(--shadow); transition: .25s;
}
.post-card:hover { transform: translateY(-2px); text-decoration: none; border-color: var(--accent); }
.post-card .pdate { color: var(--muted); font-size: .83rem; letter-spacing: .08em; font-family: var(--mono); }
.post-card h3 { font-size: 1.25rem; margin: 8px 0 6px; color: var(--text); letter-spacing: .03em; line-height: 1.5; }
.post-card p { color: var(--muted); font-size: .95rem; line-height: 1.75; }
.post-card .more { display: inline-block; margin-top: 10px; color: var(--accent-ink); font-weight: 600; font-size: .9rem; }

.empty { text-align: center; color: var(--muted); padding: 60px 0; }

/* ---------- 文章阅读页 ---------- */
.article { max-width: var(--articlew); margin: 0 auto; padding: 56px 24px 72px; }
.article .pdate { color: var(--muted); font-size: .85rem; letter-spacing: .1em; font-family: var(--mono); }
.article h1 { font-size: 2rem; line-height: 1.45; letter-spacing: .03em; margin: 10px 0 14px; }
.article .psummary {
  color: var(--muted); border-left: 3px solid var(--accent);
  padding: 6px 0 6px 16px; margin-bottom: 30px; font-size: .98rem;
}
.markdown-body { font-size: 1.02rem; line-height: 1.95; letter-spacing: .015em; }
.markdown-body p { margin: 1.1em 0; }
.markdown-body h2 { font-size: 1.4rem; margin: 1.8em 0 .7em; letter-spacing: .04em; padding-bottom: .3em; border-bottom: 1px solid var(--line); }
.markdown-body h3 { font-size: 1.18rem; margin: 1.6em 0 .6em; letter-spacing: .04em; }
.markdown-body ul, .markdown-body ol { margin: 1em 0 1em 1.4em; }
.markdown-body li { margin: .45em 0; }
.markdown-body blockquote {
  margin: 1.4em 0; padding: 4px 0 4px 18px; color: var(--muted);
  border-left: 3px solid var(--accent);
}
.markdown-body code {
  font-family: var(--mono); font-size: .88em; background: var(--surface-2);
  padding: .15em .45em; border-radius: 6px;
}
.markdown-body pre {
  background: var(--surface-2); border: 1px solid var(--line); border-radius: 12px;
  padding: 18px 20px; overflow-x: auto; margin: 1.4em 0; line-height: 1.7;
}
.markdown-body pre code { background: none; padding: 0; font-size: .85rem; }
.markdown-body img { border-radius: 12px; margin: 1.2em 0; box-shadow: var(--shadow); }
.markdown-body hr { border: none; border-top: 1px solid var(--line); margin: 2em 0; }
.markdown-body table { border-collapse: collapse; width: 100%; margin: 1.4em 0; font-size: .92rem; }
.markdown-body th, .markdown-body td { border: 1px solid var(--line); padding: 10px 14px; text-align: left; }
.markdown-body th { background: var(--surface-2); }

.back-link { display: inline-flex; align-items: center; gap: 6px; margin-bottom: 8px; font-size: .92rem; }

/* ---------- 关于页 ---------- */
.about { max-width: var(--articlew); margin: 0 auto; padding: 56px 24px 72px; }
.about h1 { font-size: 1.9rem; letter-spacing: .04em; margin-bottom: 18px; }
.about-card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 32px; box-shadow: var(--shadow); margin-bottom: 20px;
}
.about-card p { margin: .8em 0; color: var(--text); }
.about-card p.muted { color: var(--muted); }
.fact-row { display: flex; gap: 12px; padding: 10px 0; border-bottom: 1px dashed var(--line); font-size: .95rem; }
.fact-row:last-child { border-bottom: none; }
.fact-row .k { color: var(--muted); width: 92px; flex: none; }

/* ---------- 404 ---------- */
.notfound { text-align: center; padding: 100px 24px; }
.notfound h1 { font-size: 4rem; color: var(--accent); letter-spacing: 0; }
.notfound p { color: var(--muted); margin: 12px 0 24px; }

/* ---------- 移动端 ---------- */
@media (max-width: 720px) {
  .menu-btn { display: grid; }
  .nav-links {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    background: var(--surface); border-bottom: 1px solid var(--line);
    flex-direction: column; align-items: stretch; padding: 12px 20px 16px; gap: 2px;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; }
  .nav-right { display: flex; gap: 8px; align-items: center; }
  .hero { padding: 56px 0 44px; }
  .hero-inner { flex-direction: column; text-align: center; gap: 24px; }
  .avatar { width: 118px; height: 118px; }
  .hero h1 { font-size: 1.8rem; }
  .hero-actions { justify-content: center; }
  .article h1 { font-size: 1.55rem; }
  .link-groups { grid-template-columns: 1fr; }
}